Don't be told otherwise, every piece of aluminium, metallic paint, zinc plated hose connections, lightly machined buttstocks, brake levers and possibly more are engraved with this product. I saw white haze on part of my first Ducati after using this and I have a feeling it was because I hadn't finished it enough. I later switched to bikebrite and didn't have this problem. A few years later I bought a gallon of the stuff and sprayed it on my new Honda. Now I have a white coating all over the crankcase, the gold plating on the rims looks damaged, the rear wheel set looks awful, the aluminum radiators are clearly damaged. I will keep a gallon on hand to spray before the pressure washer to clean before the pressure washer, but it will never get in my car again.